US Patent Issued to Siemens on March 18 for "Joining a laminated core to a shaft" (German Inventors)

ALEXANDRIA, Va., March 19 -- United States Patent no. 12,255,496, issued on March 18, was assigned to Siemens AG (Munich).

"Joining a laminated core to a shaft" was invented by Klaus Buttner (Hollstadt, Germany), Klaus Kirchner (Ostheim, Germany) and Matthias Warmuth (Windshausen, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A lamination of a rotor of a rotary dynamo-electric machine includes a shaft bore with a radius, at least two pull-through grooves, and two intermediate space recesses. Each of the pull-through grooves has a lamination tongue facing radially inwards towards an axis such that the lamination tongue ends facing radially inwards lie on a radius which is smaller than the radius defi...